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Energy flow and the nutrient cycling in an ecosystem
Energy flow and the nutrient cycling in an ecosystem

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... Understanding and predicting the impacts of global climate change on terrestrial ecosystems is one of the main research challenges of the 21st century. Progress towards this goal has focused on modeling the impacts of a wide array of climate change agents on key ecosystem level processes such as car ...
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Human impact on the nitrogen cycle



Human impact on the nitrogen cycle is diverse. Agricultural and industrial nitrogen (N) inputs to the environment currently exceed inputs from natural N fixation. As a consequence of anthropogenic inputs, the global nitrogen cycle (Fig. 1) has been significantly altered over the past century. Global atmospheric nitrous oxide (N2O) mole fractions have increased from a pre-industrial value of ~270 nmol/mol to ~319 nmol/mol in 2005. Human activities account for over one-third of N2O emissions, most of which are due to the agricultural sector. This article is intended to give a brief review of the history of anthropogenic N inputs, and reported impacts of nitrogen inputs on selected terrestrial and aquatic ecosystems.
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